Title :
Capacity and Performance of Adaptive MIMO System Based on Beam-Nulling
Author :
Gheryani, Mabruk ; Wu, Zhiyuan ; Shayan, Yousef R.
Author_Institution :
Dept. of Electr. Eng., Concordia Univ., Montreal, QC, Canada
Abstract :
In this paper, we propose a scheme called "beam- nulling". In the beam-nulling scheme, the eigenvector of the weakest subchannel is fed back and then signals are sent over a generated subspace orthogonal to the weakest subchannel. Theoretical analysis and numerical results show that the capacity of beam-nulling is closed to the optimal water-filling at medium SNR. Additionally, signal-to-interference-plus-noise ratio (SINR) of MMSE receiver is derived for beam-nulling. Then the associated average bit-error rate (BER) of beam-nulling is given numerically and verified by simulation. Simulation results are provided to compare beam-nulling with beamforming. To improve performance further, beam-nulling is concatenated with linear dispersion code. Simulation results are also provided to evaluate the concatenated scheme beamforming at the same data rate.
Keywords :
MIMO communication; array signal processing; channel capacity; channel coding; concatenated codes; eigenvalues and eigenfunctions; error statistics; least mean squares methods; linear codes; radio receivers; wireless channels; BER; MMSE receiver; adaptive MIMO system; beam-nulling scheme; bit-error rate; channel capacity; concatenated scheme beamforming; eigenvector; linear dispersion code; Adaptive systems; Array signal processing; Channel capacity; Concatenated codes; Feedback; MIMO; Receiving antennas; Signal generators; Transmitters; Transmitting antennas;
Conference_Titel :
Communications, 2009. ICC '09. IEEE International Conference on
Conference_Location :
Dresden
Print_ISBN :
978-1-4244-3435-0
Electronic_ISBN :
1938-1883
DOI :
10.1109/ICC.2009.5198804
